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首页> 外文期刊>Advanced energy materials >Graphene Layers-Wrapped Fe/Fe_5C_2 Nanoparticles Supported on N-doped Graphene Nanosheets for Highly Efficient Oxygen Reduction
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Graphene Layers-Wrapped Fe/Fe_5C_2 Nanoparticles Supported on N-doped Graphene Nanosheets for Highly Efficient Oxygen Reduction

机译：N掺杂石墨烯纳米片上负载石墨烯层包裹的Fe / Fe_5C_2纳米颗粒，用于高效降氧

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摘要

Synthesis of highly efficient nonprecious metal electrocatalysts for the oxygen reduction reaction (ORR) superior to platinum (Pt) is still a big challenge. Herein, a new highly active ORR electrocatalyst is reported based on graphene layers-wrapped Fe/Fe5C2 nanoparticles supported on N-doped graphene nanosheets (GL-Fe/Fe5C2/NG) through simply annealing a mixture of bulk graphitic carbon nitride (g-C3N4) and ferrocene. An interesting exfoliation-denitrogen mechanism underlying the conversion of bulk g-C3N4 into N-doped graphene nanosheets is revealed. Owing to the high graphitic degree, optimum N-doping level and sufficient active sites from the graphene layers-wrapped Fe/Fe5C2 nanoparticles, the as-prepared GL-Fe/Fe5C2/NG electrocatalyst obtained at 800 degrees C exhibits outstanding ORR activity with a 20 mV more positive half-wave potential than the commercial Pt/C catalyst in 0.1 m KOH solution and a comparable onset potential of 0.98 V. This makes GL-Fe/Fe5C2/NG an outstanding electrocatalyst for ORR in alkaline solution.
机译：合成优于铂（Pt）的用于氧还原反应（ORR）的高效非贵金属电催化剂仍然是一个巨大的挑战。本文中，报道了一种新的高活性ORR电催化剂，其基于石墨烯层包裹的Fe / Fe5C2纳米颗粒负载在N掺杂的石墨烯纳米片（GL-Fe / Fe5C2 / NG）上，通过简单地退火本体石墨氮化碳（g-C3N4）的混合物）和二茂铁。揭示了有趣的剥落-脱氮机制，该机制是将大量g-C3N4转化为N掺杂的石墨烯纳米片的基础。由于高石墨化度，最佳的N掺杂水平和来自石墨烯层包裹的Fe / Fe5C2纳米颗粒的足够的活性位点，因此在800℃下制备的GL-Fe / Fe5C2 / NG电催化剂显示出优异的ORR活性，且在0.1 m KOH溶液中，半波的正半波电势要比市售Pt / C催化剂高20 mV，起始电势为0.98V。这使得GL-Fe / Fe5C2 / NG成为碱性溶液中ORR的出色电催化剂。

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  • 来源
    《Advanced energy materials》 |2018年第9期|1702476.1-1702476.8|共8页
  • 作者

    Hu Enlai; Yu Xin-Yao; Chen Fang; Wu Yadan; Hu Yong; Lou Xiong Wen (David);

  • 作者单位

    Zhejiang Normal Univ, Dept Chem, Key Lab Minist Educ Adv Catalysis Mat, Jinhua 321004, Peoples R China;

    Zhejiang Univ, Sch Mat Sci & Engn, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Normal Univ, Dept Chem, Key Lab Minist Educ Adv Catalysis Mat, Jinhua 321004, Peoples R China;

    Zhejiang Normal Univ, Dept Chem, Key Lab Minist Educ Adv Catalysis Mat, Jinhua 321004, Peoples R China;

    Zhejiang Normal Univ, Dept Chem, Key Lab Minist Educ Adv Catalysis Mat, Jinhua 321004, Peoples R China;

    Zhejiang Univ, Sch Mat Sci & Engn, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    graphene; iron carbides; nanoparticles; oxygen reduction reaction;

    机译：石墨烯;碳化铁;纳米粒子;氧还原反应;

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